Abstract: An assembly for hanging picture frames and other objects to a vertical support includes a base with locking grooves that is mounted to the vertical support and a wheel disposed on the base and which is movable thereon. The wheel includes a set of teeth disposed around its perimeter and where one of those teeth is received within one of the base's locking grooves. A mounting knob fixed off-center to the front surface of the wheel is designed to receive the item to be mounted thereon. To mount a picture frame or other object, the assembly is mounted to the vertical support, the object to be mounted is mounted on the assembly's knob, the amount of correction to the mounted object's vertical and/or horizontal position is ascertained, the object is removed from the knob, the wheel of the assembly is moved accordingly and then locked in place, and the object is re-mounted on the knob.